I would move the water bowl. Do you enjoy drinking warm water? Heat promotes bacterial growth as well. Try to up the temp into the high 80s on one end as well. You need a gradient, meaning a cool and hot side. Aspen is Aspen wood bark. Not the best for a jungle because it molds easily. However, nothing wrong with using it as long as you spot clean it and change it every month or so. If you see mold clean a lot of that area.